<template>
  <div class="home-container">
    <!-- 顶部导航栏组件 -->
    <van-nav-bar class="page-nav-bar" fixed>
      <van-button
        class="search-btn"
        slot="title"
        type="info"
        size="small"
        round
        icon="search"
        to="/search"
        >搜索</van-button
      >
    </van-nav-bar>
    <!-- 频道列表 -->
    <van-popup
      v-model="isChannelEditShow"
      closeable
      close-icon-position="top-left"
      position="bottom"
      :style="{ height: '100%' }"
    >
      <channel-edit
        :my-channels="channels"
        :active-index="active"
        @update-active="onUpdateActive"
      />
    </van-popup>
    <!-- 
      通过 v-model 绑定当前激活标签对应的索引值，默认情况下启用第一个标签
      通过 animated 属性可以开启切换标签内容时的转场动画
      通过 swipeable 属性可以开启滑动切换标签页
    -->
    <van-tabs class="channel-tabs" v-model="active" swipeable animated>
      <van-tab
        :title="channel.name"
        v-for="channel in channels"
        :key="channel.id"
      >
        <!-- 文章列表 -->
        <article-list ref="article-list" :channel="channel" /> </van-tab
      >>
      <!-- 汉堡按钮 -->
      <div slot="nav-right" class="placeholder"></div>
      <div
        slot="nav-right"
        class="hamburger-btn"
        @click="isChannelEditShow = true"
      >
        <i class="toutiao toutiao-gengduo"></i>
      </div>
    </van-tabs>
  </div>
</template>

<script>
// 导入封装的 getUserChannels 方法
import ChannelEdit from "./components/channel-edit";
import ArticleList from "./components/article-list.vue";
import { getUserChannels } from "@/api/user";
import { mapState } from "vuex";
import { getItem } from "@/utils/storage.js";
export default {
  name: "HomeIndex",
  data() {
    return {
      active: 0,
      channels: [], //频道列表数据
      isChannelEditShow: false, // 控制编辑频道弹出层的显示状态
    };
  },

  created() {
    this.loadChannels();
  },
  methods: {
    onUpdateActive(index, isChannelEditShow = true) {
      this.active = index;
      this.isChannelEditShow = isChannelEditShow;
    },

    async loadChannels() {
      // try {
      //   const { data } = await getUserChannels()
      //   this.channels = data.data.channels
      // } catch (err) {
      //   this.$toast('获取频道数据失败')
      // }
      let channels = [];

      if (this.user) {
        // 已登录，请求获取用户频道列表
        const { data } = await getUserChannels();
        channels = data.data.channels;
      } else {
        // 未登录，判断是否有本地的频道列表数据
        const localChannels = getItem("TOUTIAO_CHANNELS");
        // 如果存在本地的频道列表数据
        if (localChannels) {
          channels = localChannels;
        } else {
          // 没有，请求获取默认频道列表
          const { data } = await getUserChannels();
          channels = data.data.channels;
        }
      }

      this.channels = channels;
    },
  },
  computed: {
    ...mapState(["user"]),
  },
  components: {
    ArticleList,
    ChannelEdit,
  },
};
</script>

<style scoped lang="less">
.home-container {
  padding-top: 174px;
  padding-bottom: 100px;
  /deep/ .van-nav-bar__title {
    max-width: unset;
  }
  .search-btn {
    width: 555px;
    height: 64px;
    background-color: #5babfb;
    border: none;
    font-size: 28px;
    .van-icon {
      font-size: 32px;
    }
  }
}
/deep/ .channel-tabs {
  .van-tabs__wrap {
    position: fixed;
    top: 92px;
    z-index: 1;
    left: 0;
    right: 0;
    height: 82px;
  }

  .van-tab {
    min-width: 200px;
    border-right: 1px solid #edeff3;
    font-size: 30px;
    color: #777777;
  }

  .van-tab--active {
    color: #333333;
  }

  .van-tabs__nav {
    padding-bottom: 0;
  }

  .van-tabs__line {
    bottom: 8px;
    width: 31px !important;
    height: 6px;
    background-color: #3296fa;
  }
}
.placeholder {
  flex-shrink: 0;
  width: 66px;
  height: 82px;
}
.hamburger-btn {
  position: fixed;
  right: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  width: 66px;
  height: 82px;
  background-color: #fff;
  opacity: 0.902;

  i.toutiao {
    font-size: 33px;
  }

  &:before {
    content: "";
    position: absolute;
    left: 0;
    width: 1px;
    height: 100%;
    background-image: url(~@/assets/gradient-gray-line.png);
    background-size: contain;
  }
}
.home-container {
  padding-top: 174px;
}
</style>
